Burglarproof lock



N. RANCOUR BURGLARPROOF LOCK Filed May 10, 1922 flapol em Kan 0v?Patented Dec. 23, 1924.

ITED STAT NAPOLEON RANGOUR, OF HIG-FELJLND PARK ItEICI-IIGAN.

BURGLARFROOF LOCK.

Application filed May 10,

T all whom it may concern Be it known that I, ilAlOLEON Ransom. acitizen of the United States 01 iunerica residing at Highland Park, inthe county of lvayne and State of Michigan, have invented certain newand useful Improvements in lnu-glarproof Locks, oi which the followingis a specification reference being had therein to the accompanyingdrawings.

This invention relates to burglar-proot locking devices for use inconnection with locks having a sliding bolt for the locking element.

in object of the invention is to provide a reliable and elticient devicewhich will operate automatically to retain the bolt of the lock inextended or locked position.

Another object. is to provide a device which can be readily appiied toany door. window or the like and when applied will be in a position onthe door or window which will preclude any possibility of an unauthorized person withdrawing the bolt from its keeper to unlock thedoor or win dow.

.iinother object is to provide a strong and durable device which can beniai'iul acturod at a very low cost.

lYith the above and other objects in view. the invention consists ofcertain novei 'i'eatures 0t construction as will be more fully describedand particularly pointed out in the appended claims.

In the accompanying drawing:

Figure 1 is a perspective view of the locking device applied to a door;

Figure 2 is a detail sectional view taken on the line 2-2 of Figure 1;

Figure 3 is a detail view of the plunger:

Figure 4. is a detail view showing a slight ly modified form ofconstruction;

Figure is a detail view of the plunger illustrated in Figure 4:.

Referring now to the drawings in which like characters of referencedesignate corresponding parts throughout the several views, thenumeral 1. designates a door having a recess formed in the outer edgethereof which receives a lock 2 having a sliding bolt 3 adapted toengage a keeper 4. The bolt 3 is actuated by suitable mechanism withinthe lock which is controlled by a key 5.

A. plunger 6, preferably of steel, extends through aligned openings 7and 8 respectively in the door 1 and lock 2 and is normally n engagementWith the adjacent side of the 1822. Serial No. 559,710.

bolt. The plunger is also adapted to engage a recess 9 formed in thebolt 3 intermediate the ends thereof when the bolt is in extended orlocked position. The outer end of the plunger (3 is reduced to providean annular shoulder 10 and is threaded as shown at 11.

A tint spring 12 of any suitable material is reinoval'ily secured to thedoor adjacent to the outer edge thereof and is provided with an opening13 at its upper end which receives the threaded outer plunger. A.knurled nut 1% engages the threaded portion of said plunger to retain 'the upper end of said spring in engagement with the annular shoulder 10whereby the plunger is normally urged inwardly under tension of thespring. A headed pin 15 passes through an opening 16 in the springadjacent to the upper end thereof and is reiuovahly secured to the doorto limit the outward movement of the spring.

in the modification illustrated in Figure l. a plunger 20 is threaded atits outer end as shown at 21. A flat spring 22 is remova y secured tothe door adjacent the outer edge tl'iereot. and is provided with anopening in the upper end thereof which receives the threaded outer endof thc plungir. An interiorly threaded metallic washer 23 and a knurlednut 2i are adjustably mounted on the threaded outer end of the plungerupon opposite sides of the spring. lVith this construction, the tensionof the spring can be regulated by adjusting the washer and nut on thethreaded outer end of the plungerto vary the distance between the upperend of the spring and the door when the bolt is in retracted or unlockedposition.

in use when the key is operated, the lock mechanism will move the boltoutwardly into engagement with the keeper to as siune a locked positionwhereupon the recess J in the bolt will re with the aligned openings 7and 8 respectively. The plunger acting under the influence oi the springwill then move inwardly into engagement with the recess 9 thus retainingthe bolt in locked position. lVhen it is desired to unlock the door, theknurled nut is pulled outwardly to disengage the plunger from the recess9 in the bolt whereupon the key may be operated for withdrawing the boltfrom its keeper. I

l Vhenever for any reason it is desired to render the plungerinoperative a curved wedgeshaped member is pivotally end of said mountedupon the door above the plunger. The lower free end of the wedge-shapedmember is adapted to extend between the spring and door to retain theplunger in outermost position,

WVhile it is believed that from the fore going description thenature'and advantages of the invention will be readily apparent, Idesire to have it understood that I do not limit myself to what isherein shown and described, and that such changes may be resorted towhen desired as fall within the scope of what is claimed.

What I claim as my invention is:

1. The combination with a lock having a sliding bolt, of a reciprocatoryplunger, spring means for moving said plunger into engagement with saidbolt to retain the same in locked position, and movable means engageablewith said spring means for retaining said plunger out of engagement withsaid bolt.

2. The combination with a lock having a sliding bolt, of a reciprocatoryplunger, spring means for moving said plunger into engagement with saidbolt to retain the same in locked position, and a pivoted memberengageable with said spring means for retaining said plunger out ofengagement with said bolt.

3. The combination with a lock having a sliding bolt, of a plunger,spring means for moving said plunger inwardly into engagement with saidbolt to retain the same in locked position, means for moving saidplunger outwardly to disengage the same from said bolt to permit thelatter to re.- turn to unlocked position, and means extending throughsaid spring means for limiting the outward movement of said plunger.

4'. The combination with a lock having a sliding bolt, of a plunger,spring means for moving said plunge-r inwardly into engagement with saidbolt to retain the same in locked position, means for moving saidplunger outward to disengage the same from said bolt to permit thelatter to return to un locked position, and a headed element extendingthrough said spring means for limiting the outward movement of saidplunger,

5; The combination with a lock having a sliding bolt, of a reciprocatoryplunger engageab'le with said bolt to retain the same in lockedposition, a spring for moving said plunger into engagement with saidbolt, and movable means for rendering said spring inoperative.

6. The combination with a lock having a sliding, bolt, of a memberengageable with said bolt to retain the same in a pre-determinedposition, yiel'dable means for moving said member into engagement withsaid bolt, means for disengaging said member from said bolt, and meansengageable with said yieldable means for rendering said memberinoperative.

7. The combination with a lock having a sliding bolt, of a membere-ngageable with said bolt to retain the same in a predeter minedposition, means for moving said member in one direction to engage saidbolt, means for moving said member in another direction to disengagesaid member from said bolt and means engageable with one of the meansaforesaid for rendering the same inoperative.

8. The combination with a lock having a movable bolt, of a memberengageable with said bolt to retain the same in a pre-determinedposition, means for moving said member in one direction to engage saidbolt, means for moving said member in another direction to disengagesaid member from said bolt, means engageable with one of the meansaforesaid for limiting the movement of the member in one direction, andmeans also engageable with one of the means aforesaid for limiting themovement of the member in another direction.

9. The combination with a lock having a movable bolt, for a memberengageable with said bolt. to retain the same in a predeterminedposition, a yieldable element for moving said member in one direction toengage said bolt, means connected to the member for moving the same inanother direction to disengage said member from the bolt, a swinginglymounted member engageable with said yieldable element for limiting themovement of the member in one direction, and a headed element engageablewith said yieldable element for limiting the movement of said member inanother direction.

In testimony whereof I affix my signaiure.

NAPOLEON RANCOUR.

